I need a simple utility that allow me to check if a PC, attached to a local network, is able to reach a specified address:port using specified protocol like TCP or UDP
Machine's OS I will use to do the check is Windows XP.
If you get a connection, something replies on that port.
If you get an error message, no program is listening on that port, or the hostname is invalid:
You can use iperf to check if UDP ports are reachable or not.
Example: Testing if port 5093 UDP is open on remote server 10.0.0.1
As you can see the client successfully transferred 893 datagrams meaning the port is open indeed. In case the firewall was blocking the port, you should read a message like this: